Properties of Cementitious Materials Without Clinker for Fluid Solidified Soil

Abstract

Abstract: Fluid solidified soil is a new material developed in recent years to improve backfill quality of narrow space in municipal and construction engineering. In this paper, steel slag powder, CFB desulfurization ash, rice husk ash and other low-quality solid wastes were used as clinker-free cementitious materials to prepare fluid solidified soil, and the unconfined compressive strength, drying shrinkage property, heavy metal leaching property and microstructure of fluid solidified soil were tested. The research shows that theflow expansion degree and unconfined compressive strength of fluid solidified soil prepared by cementitious materials without clinker meet the requirements of general filling engineering, the drying shrinkage value of hardened body is significantly lower than that of cement solidified soil with the same content, and there is no risk of excessive leaching toxicity of heavy metals. Under the synergistic effect of various solid wastes, the soil particles aggregate into clusters, and the pores are significantly reduced. The flocculent gel and acicular ettringite crystal are intertwined, adhere to the surface of soil particles and connect to soil particles, which enhance the strength of solidified soil.

Key words: fluid solidified soil, solid waste, unconfined compressive strength, microstructure, drying shrinkage, heavy metal leaching

CLC Number:

TU472

ZHOU Yongxiang, LIU Qian, WANG Zuqi, HAO Tong, LENG Faguang. Properties of Cementitious Materials Without Clinker for Fluid Solidified Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(10): 3548-3555.

References

[1] PODE R. Potential applications of rice husk ash waste from rice husk biomass power plant[J]. Renewable and Sustainable Energy Reviews, 2016, 53: 1468-1485.
[2] 汪知文,李碧雄.稻壳灰应用于水泥混凝土的研究进展[J].材料导报,2020,34(9):9003-9011.
WANG Z W, LI B X. Research progress on application of rice husk ash in cement and concrete[J]. Materials Reports, 2020, 34(9): 9003-9011 (in Chinese).
[3] 孙朋,郭占成.钢渣的胶凝活性及其激发的研究进展[J].硅酸盐通报,2014,33(9):2230-2235.
SUN P, GUO Z C. Research progress on cementitious activity and its activation of steel slag[J]. Bulletin of the Chinese Ceramic Society, 2014, 33(9): 2230-2235 (in Chinese).
[4] 陈巍.脱硫灰改善污泥脱水性能的机理及用于水泥掺料的研究[D].北京:北京科技大学,2017.
CHEN W. Research on the mechanism of improving sewage sludge dewaterability with desulfurization ash and its application as cement admixture[D]. Beijing: University of Science and Technology Beijing, 2017 (in Chinese).
[5] ZHANG N, DUAN H B, SUN P W, et al. Characterizing the generation and environmental impacts of subway-related excavated soil and rock in China[J]. Journal of Cleaner Production, 2020, 248: 119242.
[6] 周永祥,王继忠.预拌固化土的原理及工程应用前景[J].新型建筑材料,2019,46(10):117-120.
ZHOU Y X, WANG J Z. Principle of ready-mixed solidified soil and its prospects for engineering application[J]. New Building Materials, 2019, 46(10): 117-120 (in Chinese).
[7] 木幡行宏.流动力学理土力学特质课题[J].土木学会论文集F,2006,62(4):618-627.
YUKIHIRO K. Mechanical properties of fluidized soil and future challenges[J]. Journal of the Japan Society of Civil Engineers F, 2006, 62(4): 618-627.
[8] 顾欢达,陈甦.河道淤泥的流动化处理及其工程性质的试验研究[J].岩土工程学报,2002,24(1):108-111.
GU H D, CHEN S. Experimental study on flow treatment and engineering properties of river silt[J]. Chinese Journal of Geotechnical Engineering, 2002, 24(1): 108-111 (in Chinese).
[9] 李建望.河道淤泥流动化处理及其稳定性研究[D].苏州:苏州科技学院,2009.
LI J W. The liquefied stabilization method and stability research for river sludge[D]. Suzhou: Suzhou Institute of Science and Technology, 2009 (in Chinese).
[10] 范猛.非压实回填土基本性能及应用研究[D].北京:北京工业大学,2009.
FAN M. Research on properties and applications of self-compacting backfill[D]. Beijing: Beijing University of Technology, 2009 (in Chinese).
[11] 邹培林.流动化处治土的强度特性试验研究[D].西安:长安大学,2016.
ZOU P L. Research on strength properties of flowable treated soil[D]. Xi'an: Chang'an University, 2016 (in Chinese).
[12] KALIYAVARADHAN S K, LING T C, GUO M Z, et al. Waste resources recycling in controlled low-strength material (CLSM): a critical review on plastic properties[J]. Journal of Environmental Management, 2019, 241: 383-396.
[13] American Concrete Institute. Cement and concrete terminology[R]. ACI 116, 2000.
[14] 彭春元,许日昌,殷素红,等.水泥产业低碳技术路线图的研究方法探讨[J].材料导报,2012,26(19):106-111.
PENG C Y, XU R C, YIN S H, et al. Study on method of low carbon technique roadmap in cement industry[J]. Materials Review, 2012, 26(19): 106-111 (in Chinese).
[15] ZHANG C Y, HAN R, YU B Y, et al. Accounting process-related CO₂ emissions from global cement production under shared socioeconomic pathways[J]. Journal of Cleaner Production, 2018, 184: 451-465.
[16] 张登良.加固土原理[M].北京:人民交通出版社,1990.
ZHANG D L. Principle of soil reinforcement[M]. Beijing: People's Transportation Press, 1990 (in Chinese).
[17] 吴中伟.混凝土科学技术近期发展方向的探讨[J].硅酸盐学报,1979,7(3):262-270.
WU Z W. An approach to the recent trends of concrete science and technology[J]. Journal of the Chinese Ceramic Society, 1979, 7(3): 262-270 (in Chinese).
[18] 张涛,刘松玉,蔡国军.固化粉土小应变剪切模量与强度增长相关性研究[J].岩土工程学报,2015,37(11):1955-1964.
ZHANG T, LIU S Y, CAI G J. Relationship between small-strain shear modulus and growth of strength for stabilized silt[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(11): 1955-1964 (in Chinese).
[19] NGUYEN Q D, AFROZ S, ZHANG Y D, et al. Autogenous and total shrinkage of limestone calcined clay cement (LC3) concretes[J]. Construction and Building Materials, 2022, 314: 125720.
[20] LI J Y, YAO Y. A study on creep and drying shrinkage of high performance concrete[J]. Cement and Concrete Research, 2001, 31(8): 1203-1206.